<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>圆面积和周长计算</title>
</head>
<body>
<h1>圆面积和周长计算器</h1>
<form action="CircleAreaServlet" method="post">
    <label for="radius">请输入圆的半径:</label>
    <input type="text" id="radius" name="radius">
    <input type="submit" value="计算">
</form>
</body>
</html>